Damper regulator



J. M. SULLIVAN DAMPER REGULATOR Mar. ,27, 1923.

Patented Mar. 27, 1.923.

UNITED STATES JOSEPH rr. SULLIVAN, or DETROIT, IuIoHIeAIv.

DAMPER REGULATOR.

Application led April 16, 1921. Serial No. 461,931.

To all whom 'it Ina/y concer/a.'

Be it known that I, JosnrI-I M. SULLIVAN, a citizen of the United Statesof America, residing at Detroit, in the county of Wayne and State 'ofMichigan, have invented certain new and useful Improvements in L DamperRegulators, of'which the following' is aspecification, reference beinghad therein to the accompanying drawings. y

This invention relates to a damper regulator for boilers and has specialreference to that class of automatic damperregulating devices which "areJactlmlated by extreme pressure to adjust a damper controlling the draftto the combustion chamber of the boiler andV consequently the generation`of steam by the boiler.' I am aware of such devices being used and theregulation of a damper in two extremes, that is, the damper is eitheropen or closed and there is no intermediate position to which the damperis adjusted, consequently there is either a high or low pressure ofsteam in the boiler, in one instance probably a waste of fuel, and inthe other instance not suiiicient pressure for power. v My inventionaims to provide a damper regulating device by which the damper may beminutely adjusted in accordance `with a boiler pressure, thus insuring apositive and uniform regulation without any abrupt changes in boilerpressure. i

My invention further aims to provide an intercepting valve that may beeasily and quickly installed in damper `regulators already in use, so asto convert such extreme damper regulators to regulators permitting j Jtion;

of a wider-range of damper adjustment.

My invention alsol aims to vimprovedamper regulator devices by certainmechanical refinements which lend greater sensitiveness tothe devices,facilitates manu-- facture, and afford a higher degree of etliciency inthe automatic control of boilers,

furnaces and other heating apparatus.

My invention will be hereinafter described and then claimed, andreference will now be had .to the drawings, Awherein vFi re 1 is a frontelevation of the damper regu ating device, partly broken away and partlyin section, showi its lrelation-to a damper and parts ofthe installationconveniently arranged for the sake of illustral Fig. 2 is a verticaltransverse sectional view of the regulator valve taken 'on a plane at' aright angle to the section of the valve shown in Fig. 1;

Fig. 3 -is a horizontal sectional 'view' of the regulator valve; and

nected a pipe or conduit 5. This pipe o`r conduit supplies steam to thediaphragm casing 4 at boiler pressure and consequentlyleads from theboiler (not shown).

Suitably mounted in the diaphragm casing 4 is a diaphragm 6 having acentral wear or Contact member 7 normally engaging the knife edge orcontact point 8 of a lever socket 9, said lever socket having itsbifurcated inner end or short arm 10 apertured, as at 11, to receiveknife edge pivot` members 12 carried bythe diaphragm casing 4.

yThe lever socket 9 is limited in its movement relative to the diaphragmcasing 4 by a set screw 13 carriedbythe lever and` e15- tending throughan'apertured lug or bracket Fig. 4 is a cross sectional view taken on 14of the diaphragm casing 4, and detacha- Vbly mounted in the lever socketis a long` lever 15 disposed in a plane parallel to the instrument board1.

f On the outer end of the lever 15 is an adjustable vsuspension member16 for a weight 17, said weight maintaining the contact point 8 of thelever ,socket 9, constantly,l

in engagement with the contact member of the .diaphragm 6, so that steampressure in the diaphragmcasing 4 may elevate the outer end of the lever1 Extending outwardly from the instrument board 1 is a stud 18 andadjustable on `said stud is the apertured boss 19 of the.

regulator valve body 420. The kmanner of supporting the valve body 20permits of it being correctlyl positioned relative to `the' lever 4 15"and also facilitates connections with said valve body for purposes whichwill hereinafter appear.

The valve body 20 is provided with a longitudinal central fbore 21 andin said valve. body, about the bore 21 are an inlet chamber 22,*adischarge chamber 23, and

with the bottom chamber 26 of the valve4 body, said plug having adischarge pipe or conduit 32. The plug 27 is tubular and communicateswith the top chamber of the valve body 20, and slidable in the plug 27and the liner 29 and extending into 'the lplug 28 isfa hollow valve stem33 provided `with chambers 34 and 35.

The chamber walls 34 have opposed ports 36 and 37 and the chamber walls35 have opposedI ports may be blanked or closed by walls of the liner29, but the ports 36 are adapted to ,constantly communicate with thetopv cham-2 ber 25 of the valve body.

Communicating with the chamber' 22 of the valve body 20 is a pipe orconduit 40 4ada ted to admit water or a motive liguid to t e chamber 22.Since the valve is used as a regulator in connection with a boiler, itis preferable to use water under pressure as a motive liquid forperforming work, as will hereinafter appear.

rlhe discharge chamber 23 of the valve body is connected by a pipe orconduit 41 to the top of a vertically disposed cylinder 42 suitablysupported from the instrument board 1. vThe bottom of the cylinder 42has an atmospheric port 43 and slidable in the top of the cylinder is apiston rod 44 provided with a conventional form of piston 45 within thecylinder 42. The cylinder 42 is adapted to receive the motive liquidfrom the valve body 20 and such motive liquid and the cylinderconstitute power means for adjusting a damper.

To illustrate how .a damper may be adjusted, l: show a flue, stack orconduit 46 having a lshutter or damper 47 therein. The damper 47 is onva pivot 48 provided with a sheave 49 and trained over the sheave 49 is aiiexible member 50, as a cable, said iexible member being trained overlother sheaves 51 yand having its ends attached to a weight orcounterbalance 52 and to the end of the piston rod 44. The weight or Y'counterbalance 52 has a tendency to constantly open the damper 47 and bylowering the piston 45 within the cylinder 42, the damper 47 may beadjusted towards a closed position or completely closed.

Slidably mounted on the lever 15 and secured in a xed sition relativethereto is a bracket 53 provided with a side bearing 54 for a rock shaft55. One end of the rock shaft 55 has a cross head 56 and slidable insaid cross head is a block 57 having a.

by a link 61 Yt0 the lever 15, and said arm is adapted to occupy aposition normally parallel to the lever 15. j

Attached to the opposite end of the rock shaft 55is a depending crank 62and the lower end of said crank is connected by a link 63 to a couplinglink 64. The coupling link 64 forms part of a flexible'member or 38 and39. Since the valve stem 33 is slid-. able in the valve, the ports l37,38 and 36 cable 65 trained over and under-sheaves 66. One end of thecablev 65 is attached to the upper end of the piston rod '44, and theopposite end of the cable 65 is provided with a weight or counterbalance67. The weight 67 cooperates with the weight 52 in vrmain- V taining thepiston 45 intermediate the ends of the cylinder 42 with the damper 47 inwhat may be considered a midway position,

so that it may be either adjusted towards a full open position o r afull closed position, depending on 'the movement of the piston 45Y inthe cylinder 42,

For the 'purposes ,of explaining the operation of the f regulator, themidway position of the damper 45 may be considered normal-with theboiler or boilers operating at a desired steam pressure.

By reference to the valve'in Fig. 1 it will be noted that theintermediate .ports 37 and 38 of the valve stem 33 are blanked by thewalls of the linerv 29, and assuming that the pressure of a boilerincreases, the diaphragm 6 will be expanded or flexed upwardly to raisethe lever 15 and the valve stem 33 which is articulated with said leverby the and port 38, permitting the `water or motive liquid, underpressure, to enter the `pipe or conduit 41 and the upper end of thecylinder 42. The water will Vshift the piston 45 downwardly within thecylinder 42 and shift the damper 47 toward a closed position reducingthe draft in the flue 46 consequent- .the exhaust pipe or.conduit 32.

1y reducing steam pressure at the boiler or boilers.

Since motive liquid is admitted to the cylinder 42 there would be a fullstroke of the piston 45 and complete closing of the damper 47 if noprovision were made for intercepting the stroke of the piston 45 andconsequently the t'ull closing movement of the damper 47. Theintercepting action takes place after the initial movement of the piston45 and such action is brought about by the weight 67 shifting the crank62 to rock the shaft and turn the cross head 56 at an angle to itsoriginal plane. That end of the crossA head ad'acent the Valve body 2Owill -be lowered caus ng the block 57 to shift and lower the arm 59.Since this arm is articulated with the valve stem 33, the valve stemwill be lowered, thereby shutting off the motive liquid to the cylinder42 and causing a cessation in the downward movement of the piston 45.This takes place before the damper 47 hashad a chance to fully move to aclosed position, therefore its movement has been intercepted and thedamper but partially closed.

Lowering of the valve stem 33 has retained the motive liquid within thecylinder 42 so as to hold the piston 45 in a shifted position. againstthe action 'of the weight 52, which has a tendency to open the damper47.

Considering a reverse operation of the regulator device and assumingthat boiler pressure has dropped below normal, there is a reducedpressure in the diaphragm casing 4 and consequently the diaphragm 6 isflexed downwardly and the lever vl5 lowered. This lever, through themedium of the bracket 53, link 61 and arm 59 causes the valve stem 33 tobe lowered, placing the valve stem ports 37 in communication with thedischarge chamber 23, consequently the motive liquid within thecylinder' 42 is released and discharges through the valve stem 33 into`the top chamber 25, exhaust cham, ber 24, bottom chamber 26 and outthrough Since the motive liquid within the cylinder 42 has been:released the weight 52 causes the pivot 48 to turn and start to openthe damper 47, but before the damper can travel Very far, its movementis intercepted. This is accomplished by the crank 62 being shifted in anopposite direction to that previously described, so that the cross. head56 will be tilted and the pivoted end of the arm l59 raised, thuscausing the valve stem 33 tobe raised and restored to its normalposition, 4

cutting off the exhaust of motive liquid from the cylinder 42.

What I claim is l.. The combination of a damper, a valve adap-ted to beadjusted and by such adjustment effect movement of said damper, an armfor adjusting said valve, a slide head at one end .of said arm, pressureactuated means adapted to bodily move said arm and said slidel head toadjust said valve in one direction, and gravity means operableindependent o the lirst mentioned means adapted to cause said slide headto slide and adjust said arm so that 'said valve is adjusted in anopposite direction.

2. In a damper regulator, a valve by which the regulation is attained,an adjustable valve stem, a lever adapted to adjust said valve stem, anarm having one end sup;

ported by said lever and adapt-ed to-be moved thereby to adjust said`valve stem in one direction, a lpivoted crank supported Jfrom saidlever, a head movable with said crank, and a slide block carried by saidhead and articulated with-the o-pposite end of said arm adapted formoving said arm to adjust the valve stem in an opposite direction.

3. In a damper regulator, the combination of a damper, a sheave foradjusting said damper, articulated cables with one of said cablestrained over said sheave, weights suspended yby said cables ascounter-balance means for said damper adapted to be unbalanced and causeeither opening or closing of said damper, fluid actuated' means adaptedto unbalance said counterbalance meansv and cause said damper to startto close, a valve controlling the operation of said fluid actuatedmeans,v pressure actuated -means adapted to adjust said valve to setsaid liuid actuated means in operation, and interceptin means actuatedby the unbalancing .of said counterbalance means adap-ted tof causeadjustment of said valve and a cessation in the operation of said fluidactuated means.

In testimony whereof I aflix my signature .in presence of two witnesses.

JOSEPH M. SULLIVAN.

